text: Thiosemicarbazide is the chemical compound with the formula HNC(S)NHNH.  A white, odorless solid, it is related to thiourea (HNC(S)NH) by the insertion of an NH center.  They are commonly used as ligands for transition metals. Many thiosemicarbazides are known.  These feature an organic substituent in place of one or more H's of the parent molecule. 4-Methyl-3-thiosemicarbazide is a simple example.
  According to X-ray crystallography, the CSN core of the molecule is planar as are the three H's nearest the thiocarbonyl group.